Bug #67633 [NEW]: A foreach on an array returned from a function not doing copy-on-write

From: tim at siliconengine dot com Operating system: CentOS 6.5 PHP version: 5.5.14 Package: Arrays related Bug Type: Bug Bug description:A foreach on an array returned from a function not doing copy-on-write Description: ------------ When passing an array by value to a function, which immediately returns that array, and then using that return value in a foreach with a reference, it allows modifying the original array as if it was passed by reference. These variants work properly: ............. Variant 1 [same main body] function z($t) { // Force copy-on-write $t[0] .= 'x'; return $t; } ............. ............. Variant 2 $a = [ 'a', 'b', 'c' ]; $b = z($a); // Assigning to variable causes proper copy-on-write behavior foreach($b as &$x) { $x .= 'q'; } print_r($a); [same z function] ............. Test script: --------------- <?php $a = [ 'a', 'b', 'c' ]; foreach(z($a) as &$x) { $x .= 'q'; } print_r($a); function z($t) { return $t; } Expected result: ---------------- Array ( [0] => a [1] => b [2] => c ) Actual result: -------------- Array ( [0] => aq [1] => bq [2] => cq ) -- Edit bug report at https://bugs.php.net/bug.php?id=67633&edit=1 --